DOVER — Bank surveillance images played a crucial role in helping police track down a local man who they say robbed Ocean National Bank earlier this week.

The images were provided to both the media and other law enforcement agencies and brought in several tips that ultimately led police to Michael Doyon, according to Police Chief Anthony Colarusso.

Doyon, 27, of 14 Church St., Apt. 2, was arrested Thursday night after police executed a search warrant at his residence. He is charged with robbery.

Doyon is being held on $100,000 cash bail following his arraignment Friday morning. Police allege he committed the robbery on Tuesday so he could purchase heroin.

Probation and Parole Officer Gregory Mourgenos provided police with their first big break in the case when he viewed the images Wednesday, according to Doyon's arrest affidavit. Mourgenos said the suspect looked like Doyon, who he had under parole supervision in 2007.

Mourgenos then put police in touch with Doyon's ex-girlfriend, who had seen the surveillance images in the newspaper. She told police she thought it was Doyon. A police officer from Somersworth also recognized the suspect to be Doyon.

Colarusso said police executed a search warrant on Doyon's residence at 9 p.m. Thursday night and found evidence linking Doyon to the robbery, including the clothing he allegedly was wearing during the robbery.

The clothing included a Chicago White Sox baseball cap, a two-tone gray Columbia jacket and a dark T-shirt with a "Dickie's" clothing brand logo.

Police also located the note Doyon allegedly gave to the bank teller when he robbed the bank, which read, "Your life is in danger ... give me all the money."

Colarusso said police also found other paper scraps in residence that appeared to be draft robbery notes.

"It appears he was practicing notes," Colarusso said.

According to the arrest affidavit the notes said, "Your life will end!" "I have a gun!" "10 thousand now," while another note stated, "I have a gun, I will shoot you!"

Doyon initially denied being involved in the robbery when police pressed him on it, but eventually admitted that he was intoxicated and decided to rob a bank to obtain money for heroin, according to the affidavit.

Police have yet to recover the less than $2,000 that was stolen from the bank, Colarusso said.

Authorities are also now saying that Doyon used an ordinary kitchen knife to rob the bank, not a large hunting knife.

Before allegedly robbing Ocean National Bank, Doyon went inside two other downtown banks, Bank of America and Holy Rosary Credit Union. He then entered Ocean National bank twice before committing the robbery at 2:18 p.m., authorities allege.

Doyon told police that he went to those banks with the intention of robbing them but couldn't muster up the courage.

Doyon is scheduled for a probable cause hearing on March 9 at Dover District Court.